The molybdenum Coatings on the surface of niobium鄄tungsten alloy nozzle and sample was deposited
by the vacuum arc plasma deposition method. And the MoSi2 coating was fabricated by the silicon pack cementation.
Investigation was made into the morphology, structure and element changing of the surface and cross鄄section of the
molybdenum disilicide coating by XRD, SEM, EDS. The oxidation resistance in staticais are at 1 800益and thermal
shock from room temperature to 1 700益are tested. The results show that the oxidation resistance of at 1 800益reach
30 hours, the thermal shock is 1 376 cycles. After engine operates 415 s at 1 450益,and 100 s at 1 610益,the coating
is not broken.